1RM Calculator & Strength Log

Enter one working set and get your true one-rep max from seven proven formulas, then turn it into exact loads for every lift.

Know your one-rep max without ever grinding out a dangerous single. Enter any working set — the weight you lifted and how many clean reps you got — and OneRepMax instantly estimates the heaviest single you could hit today.

Most 1RM apps run one formula and call it a day. OneRepMax cross-checks seven proven strength-science equations — Epley, Brzycki, Lombardi, Lander, O'Conner, Mayhew and Wathan — and gives you a blended average so your number holds up whether you tested at 3 reps or 12. Then it turns that max into a full percentage table: the exact load for warm-ups, 5x5 strength work, and hypertrophy sets, in kg or lb.

WHAT YOU GET

• A trustworthy one-rep max from seven validated formulas, not a single guess
• A complete percentage table with warm-up ramp and training loads for every set
• Per-lift logging for squat, bench, deadlift and press with personal-record tracking
• Trend charts that show your estimated max climbing week over week
• A Beginner-to-Elite strength level scored from your bodyweight for each lift
• A Learn library explaining the formulas, programming and how to test safely, with cited sources

PERFECT FOR

• Powerlifters programming their next block around accurate maxes
• Lifters running 5x5, 5/3/1 or any percentage-based plan
• Gym-goers who want to load the bar right without maxing out
• Coaches and beginners learning what the numbers actually mean

WHY NOT JUST USE A FREE WEB CALCULATOR? A web box gives you one number from one formula and forgets it the second you close the tab. OneRepMax keeps your history for every lift, blends seven equations for a number you can trust, builds your whole training table around it, and charts your progress over months — all offline.

PRIVACY Your lifts and bodyweight stay on your device. No account, no sign-up, nothing uploaded.

FULL ACCESS A free estimate is always available. Full access unlocks all seven formulas plus the blended average, per-lift logging with PRs, trend charts, and the bodyweight strength-level estimate. Upgrade weekly, yearly, or once with a lifetime purchase.

Load the bar with the right weight this session — open OneRepMax and enter your last set.

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